Anvil 8700133153, Malleable Iron Pipe Fitting, Coupling, 3/4" NPT Female, Black Finish Coupling for connecting two pipes going in the same direction Female National Pipe Taper (NPT) threads on both ends for connecting two male threaded pipes Made from malleable iron for tensile strength National Pipe Taper (NPT) threads for creating tighter seals than straight threads Black finish resists rust in oil and gas applications Coupling for connecting two pipes going in the same direction Made from malleable iron for tensile strength National Pipe Taper (NPT) threads for creating tighter seals than straight threads Black finish resists rust in oil and gas applications